[ARM GlobalISel] Widen G_GEP index operand

llvm-svn: 360127

llvm/lib/Target/ARM/ARMLegalizerInfo.cpp

@@ -146,7 +146,9 @@ ARMLegalizerInfo::ARMLegalizerInfo(const ARMSubtarget &ST) {
           .legalFor({s32, p0})
           .minScalar(0, s32);
 
-  getActionDefinitionsBuilder(G_GEP).legalFor({{p0, s32}});
+  getActionDefinitionsBuilder(G_GEP)
+      .legalFor({{p0, s32}})
+      .minScalar(1, s32);
 
   getActionDefinitionsBuilder(G_BRCOND).legalFor({s1});
 

llvm/test/CodeGen/ARM/GlobalISel/arm-legalize-load-store.mir

@@ -7,7 +7,8 @@
   define void @test_load_store_64_vfp() #0 { ret void }
   define void @test_load_store_64_novfp() #1 { ret void }
 
-  define void @test_gep() { ret void }
+  define void @test_gep_s32() { ret void }
+  define void @test_gep_s16() { ret void }
 
   attributes #0 = { "target-features"="+vfp2" }
   attributes #1 = { "target-features"="-vfp2" }
@@ -165,8 +166,8 @@ body:             |
     BX_RET 14, $noreg
 ...
 ---
-name:            test_gep
-# CHECK-LABEL: name: test_gep
+name:            test_gep_s32
+# CHECK-LABEL: name: test_gep_s32
 legalized:       false
 # CHECK: legalized: true
 regBankSelected: false
@@ -189,3 +190,30 @@ body:             |
     $r0 = COPY %2(p0)
     BX_RET 14, $noreg, implicit $r0
 ...
+---
+name:            test_gep_s16
+# CHECK-LABEL: name: test_gep_s16
+legalized:       false
+# CHECK: legalized: true
+regBankSelected: false
+selected:        false
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.0:
+    liveins: $r0
+
+    %0(p0) = COPY $r0
+    %1(s16) = G_LOAD %0(p0) :: (load 2)
+
+    ; CHECK-NOT: G_GEP {{%[0-9]+}}, {{%[0-9]+}}(s16)
+    ; CHECK: {{%[0-9]+}}:_(p0) = G_GEP {{%[0-9]+}}, {{%[0-9]+}}(s32)
+    ; CHECK-NOT: G_GEP {{%[0-9]+}}, {{%[0-9]+}}(s16)
+    %2(p0) = G_GEP %0, %1(s16)
+
+    $r0 = COPY %2(p0)
+    BX_RET 14, $noreg, implicit $r0
+...